Wear resisting insert for core making apparatus



1 1953 E. F. PETERSON 2, 5

WEAR RESISTING INSERT FOR CORE MAKING APPARATUS I Filed June 15, 1950 3 Sheets-Sheet l Nov. 17, 1953 E. F. PETERSON WEAR RESISTING INSERT FOR CORE MAKING APPARATUS Filed June 15, 1950 5 Sheets-Sheet 2 INVENTOR.

Nov. 17, 195 3 PETERSON 2,659,119

WEAR RESISTING INSERT FOR CORE MAKING APPARATUS Filed June 15, 1950 3 Sheets-Sheet 5 0 I i i (913 if:

i JQ' F [4? PAM-Am j ill/g3 36 \l V/// j? INVENTOR. 252mm f Peziensm Patented Nov. 17, 1953 WEAR RESISTING INSERT FOR CORE MAKING APPARATUS Edwin F. Peterson, Kewaiiee, Ill. Application June 15, 1950, Serial No. 168,254

6 Claims. (01. 22 13) This invention relates to an insert of resilient material for connection with a core box part or other similar unit to function as a means to counteract wear induced by an air blast impelled sand stream directed into an empty core box to fill the latter in making sand cores.

In making sand cores it is a known fact that the abrasive action of the sand as it is conducted to a core box and directed into the latter causes unavoidable diiliculties in maintenance and replacementsdue to the excessive wear to the core making parts leading to loss of time in production while adding to the expense of making cores. The action'is identical with sand blastin used for many purposes to create dull finishes or desirable controlled wear. Even in sand storms with less sand concentration, a high wind will remove the paint from automobiles and cause frosted Windshields and door glass as well.

With the present invention, the main general object is to provide resilient means made of rubber or like material which can be used in strategic locations to resist sand wear and to lengthen the useful life of a core box, or a blow plate or other part associated with core making apparatus. Metal wears relatively fast under the action of air driven sand, but experience has shown that rubber will last many times longer under the same comparable conditions of operation. This is no doubt due to the inherent resiliency of rubber and its ability to yield under impact.

It is a more specific object of the present invention to provide insert plugs in core boxes as areplaceable part thereof in locations where the sand blasts impinge against the internal surface of the core box during the filling operation. These plugs are'designed for easy assembly into sockets formed in the core box wall and also possess the facility of being easily replaceable when they start to show enough wear to warrant such procedure. By using plugs with relatively thick heads it is possible to use the plugs in places where they can'be ground down and shaped to conform with the surface contour of the core box at theplug location. If desired, the plug heads could likewise be molded to a predetermined shape for replacements of plugs adapted for a given spotin any type of a core box particularly of a more intricate internal shape or design.

Another object of this invention is to provide an insert plug having the facility of being manually applied to a core box wall or'other wall that has been supplied with an appropriate opening for the reception of such a plug. The plug comprises a head, a securing shank to hold the head in place, and a pigtail for manually drawing the plug into its socket.

Other variations in the design of the plug may be ,used to adapt sucha plug to further uses such asaconduit means in a blow plate of a core mak-.

ing machine where the plug functions as an orie fice for sand expulsion into a core box.

Other objects and advantages relating to the.

pull insert plugs of the present invention shall hereinafter appear inthe following detailed de-,

scription thereof having reference to the accompanying drawings forming a part of .thisspecification. 7 I

In the drawings:

Fig. 1 is a general vertical cross-sectional viewv taken through a core box operatively displayedas,

Fig. 3 is an end view. of the plug as seen from.

the tail end thereof;

Fig. 4showsthe same plug being pulledinto a wall socket arranged for the specific reception of the plug;

Fig. 5 illustrates the plug in'the wall socket. after the head is seated and prior to the release of. the. pigtail. which. will. then allow. the plug. shank to expandinto the shank cavity upon resuming its unstretched. and normal shape; Fig. 6 is a perspective view of a modified plug for use adjacent a dividing line of a core box, this plug also using parallel ridges surrounding the holding shank instead of a threaded contour;

Fig. 7 is a vertical sectional view through a core box to illustrate the more specific use of a pair of the Fig. 6 plugs in coacting relation at oppositesides ofa parting plane of acore box';

Fig. 8 is a fragmentary plan view of the internal portion of the core box shown in Fig.7

and containing the pair of coacting' plugs;

Fig. 9 is a side elevational view of a plug having a smooth shank for insertion into either a threaded-or smooth wall opening; 7 1 I Fig. 10 is a side elevational view of a plug almost identical with'that shown in Fig. -2, but having somewhat varied proportions to adapt the samev toanother use; V

Fig. 11 is an end view of the plug of Fig. 10 as the same appears when viewed from the pigtail end thereof; 7

Fig. 12 is a vertical cross sectional view through the plug of Fig. as the same would look when assembled with a threaded bore of a blow plate and prior to cutting or grinding down the pigtail end as shown in the Fig. 1 plugs of this character;

Fig. 13 shows a modified construction of plug having a continuous central aperture with the plug terminatin in a thin walled tube end for use in pulling the plug into place;

Fig. 14 is a cross sectional view of the Fig. 13

design of plug with the excess portion thereof cut off after assembly with a thin walled blow plate; and

Fig. shows an end view of an aperturgedp jl with the opening therein iormedpolygonally instead of round as are the openings in-Figs. 10 to 14.

Referring now to Fig. 1, the plugs of the presnt.... nven io r in icate a ee id ple I for at" ebo i a ada a l a ti n r me n toreceive sand from openings -3 a"of blow plate 3' of a sand box .4 of a; coremakin g machine. *The core box 2 is of a conventional type having acope Sanddrag B disposed in registry and supported uponja core machine table 1. Core sandis forced through: the sand openings 31]; and openings In in thejcope' 5 from within the sand boxl to-fill h fibre b x 2 i t e usual w 'The adaptation of the plugs of this invention to the use shown in Fig. 1A requiresonly minor modificationofa plug such as I Here plugs in serve as'fliners iorthe sandholes ina blow plate and their more specific constructionwill hereinafter Referring againtoFig. 1, at the start of each blow, the core'sand enters the core box in streams I I i' rom eac flmle fl' v rsineth Q C ty and impinging against the opposite wall l2 of the dragfi. Obviously each time a blow is made the rface of t or bqxwa l lw we at th points of sand impingement until this action is m ed at som s i secon in v during he fil n yc eof h coreb x: B the s i plugs I disposedi r i'positions to receive the brunt of the a d. treams W a re s iaa ee mlr areas are'provided to retard core boz r wear and to prog. h u efu life oisuqh. o e "b xes 'Plli gere estil usfiraie r 1 1E 55: t 5

- elusiveandeachcomprisesa head*l3;a shank I 4. and, ifin r rinpigla l 5- Th e n i l hr e c nfi ura on: i're mbl n co v m tiq i c w nd the ata lflii nea l fi l fi 'd'. into the" shankjat H to eliminate any corner or sharp ngle connection that loiild l'ead tb' sever n e. offt ta I5 fromiheffihank' I de a heavy nu mineral-1 @To receive a pluginsert such'as I. the core wall, I! assho'wn his vbore'd'outat '18 to a,pr-' determined depth v to snugly; receive the. head 13 the. b ue I, and fur h r man ed" and hr aded as t. I19, :ipr the e e t qnq the shank:

M or theplu I. the alig edp e in I8.

into. et r ad s n ne he .f y o n,

fi l idi wi e t w lfl i 9 3 with the exposed top of the head l' s cpincid ent and. f us wi h th in r m? HIPQ .ot' he wi wa1:..1,.2. .Th' exnqges j portion pff. the 1 .4V and its pigtail is may then be cut olr pg p g undereut the shank end of the head as at 13a. to

obtain a firmer nesting of the plug without further after adjustment because of the rubber reei nei oe When worn, a plug may be removed through heu Q a dr ft rr imh a l o the ha end of the plug 1 forcingthelatter butfofthe i r bl yas des'e ihe i' mmedi ely above Inplaceswhere the interior contour of the core boxis not flat, the plug heads can be ground down or shaped to conform witlfthe interior ednf': tour of the'core box as best illustrated at- 21 and 22inFig;1.'

' Theround head plugs ;l are well adapted for use on all open continuoussurf aces, but there are times when plugs of this nature "may have-toilie used on parting planes of a core box to counter; act wear. For this purpose," the pmgea'shown in Fig. 6 is a more feasible designh'avi'ng a square sidedhead i l. Figs. 7 and 8 show twc suchpmgs in usein a core 'box 25; having a vertical parting" plane 25 as the line of s'epaifation' 'between the halves of the core box- 25 wi-tli 'this'arrang' ment the head receiving portion of the secrets milled out in a direction normal'to the"surface commo date the" square ended headl Fig; 6 also introduces another'variation; in design which resides in the use of parallel circum ferentialridges -21 disposed about the shank ifi" for coactiori with a smooth bor'e'or one of s'i'ini-" lar configuration. -l3y'using a plurality of'ridge's 2] about the: circumference of the' shank 23, the insertion of the plug into a socket is made easier and the holding power 'o'f the than isincra'se'd to prevent displacement under normal conditions of use. When drawing the plug into place within awall socketofacore boxf'the r'idges'jwill flex over the" ridges 1 in a'socket until the mug is pulled completely into the Tsocketl I Such --lle ging' action also applies to the-threads of the shank- 14 thus alleviating the necessityof using too great with the threads in bore-Illactin'g to mid -trie- However, a' threadless bo're similar" shank'30. to 19] may also be employedto holdthes'h' 30 inasmuch as the tolerances may: 'be 'Rptjveiy closely to carry out the retention of the 'fplugi' The insertion'of shank -3ll into a'sinoothfopfi ing by pulling-the pigtail f 32 is readily rought about throughthe stretching acugr gaueipg the diameter of shank 3B;

i anew paaa: p p 33 in a somewhat lafg'er'd'iam A plane of the core'box'separation totherebyac 7 1 and .lzl lls itate me a 14. reate de l o us m qpe inejmo q',

is connected with a thinner head 35 and the shank terminates in a pigtail 36. Shank 34 is also deformed as by threads 3! for direct holding connection within a threaded opening 36 in the blow plate 3. By drawing plug la through the opening 38 in the direction of the arrows in Fig. 12 assembly is accomplished. By grinding or cutting off the excess plug material along the inner surface of the blow plate 3, the aperture or opening 33 is made continuous and the plug la assumes the appearance in which it is illustrated in Fig. 1A to function as a wear resistant blow hole liner for a blow plate 3 of a core making machine.

Another construction of pull insert 39 is depicted in Figs. 13 and 14 for use in connection with a thin core plate 49 having an opening 4| therein. The pull insert 39 comprises a thin head 42, a shank 43 and a tubular pigtail 44, with the shank 43 having an annular recess 45 adjacent the head 42 for fitted engagement within the opening 4! of the blow plate 40. By drawing the shank 43 of the plug 39 through the opening M of the plate 46 by pulling the thin walled pigtail tube 44, the plug will be snapped into place for subsequent severance of the excess portion of the plug as by cutting along the dot and dash line shown in Fig. 14. The remaining portion of the shank is thus made to form an annular lip to hold the apertured plug in place.

Fig. 15 illustrates the use of a polygonal opening 46 in a plug 41 that may have the same construction as either of the plugs shown in Fig. 12 or 13. With an opening of thisnature turning of the plug body may be accomplished by use of an appropriate tool if that should be desirable under certain conditions of use or operation.

t should be understood that the drawings are only illustrative of the fundamental concept of the invention described and that the invention is not to be limited thereto excepting in the manner hereinafter expressed in the language of the appended claims directed to the pull insert of this invention.

What I claim is:

1. In combination with a wall of a core box, a resilient plug adapted to form a portion of said wall, said plug comprising a head, a shank, and a pigtail, said core box wall having a socket shaped to snugly receive said head and shank, said shank having a ridged surface and said shank receiving portion of said wall socket having corresponding depressions to receive the shank ridges therein, and said pigtail providing means to draw said head and shank into nested relation within said socket in the core box wall with the shank ridges disposed in interlocking relation with the depressions in said shank receiving portion of said wall socket.

2. A plug adapted for connection with a wall of a piece of core making apparatus having an opening in said wall, said plug comprising a head, a shank connected with said head and adapted for insertion through said wall opening, and a pigtail connected with said shank to draw the latter through said opening, said head having an aperture therethrough and extending into said shank to a depth beyond the surface of the wall away from said head whereby severance of the extended shank will open said shank aperture to the side of the wall opposite said head.

3. A rubber plug for connection with a wall of a piece of core making apparatus having an opening in said wall, said plug comprising a head, a shank connected with said head and adapted for insertion through said wall opening, and a pigtail connected with said shank to draw the latter through said opening, said head having an aperture therethrough and extending into said shank to a depth beyond the surface of the wall away from said head whereby severance of the extended shank will open said shank aperture to the side of the wall opposite said head, and cooperative frictional locking means carried by said shank and the wall opening to secure the shank within the latter to hold said head to the wall.

4. A rubber plug for connection with a wall of a piece of core making apparatus having an opening in said wall, said plug comprising a head, a shank connected with said head and adapted for insertion through said wall opening, and a pigtail connected with said shank to draw the latter through said wall opening for frictional connection therein, said pigtail having an opening through the length thereof, and said pigtail opening extending through said shank and head to provide a passageway through the entire plug.

5. In combination, a core box wall constructed of hard material and forming a part of a piece of core making apparatus, said wall having a socket formed therein, and a resilient insert plug adapted for connection within said core box wall socket and arranged to protect said piece of core making apparatus from the abrasive action of core sand at said socket location, and said insert plug comprising a head, a shank connected thereto, and a pigtail on said shank, said head having an aperture extending therethrough and into said shank, said pigtail comprising means to pull said shank and head into said socket in said hard core box-wall, said head providing means to stop the plug within one portion of said socket with one surface of said head coincident with one surface of said wall, and said shank providing means to engage another portion of said socket to retain said head in operative coincident position relative to said wall surface.

6. In combination, a core box wall, said wall being provided with a recess in the surface of said wall and with a threaded opening leading away from said recess, and a plug of resilient material adapted to form a portion of said core box wall and comprising a cylindrical head to nest in said core box wall recess, a reduced diameter threaded shank extending axially from said head and into said threaded opening, and an elongated round bodied pigtail of smaller diameter than said shank connected with the latter and extending coaxially with respect to said head and shank to provide means for drawing said head and threaded shank into their respective receiving openings in said core box wall.

EDWIN F. PETERSON.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,597,945 Young Aug. 31, 1926 1,766,333 Forehand June 24, 1930 2,076,985 Elliot Apr. 13, 1937 2,423,341 Peterson July 1, 1947 2,510,417 Rehklau June 6, 1950 2,553,627 Barlow May 22, 1951 OTHER REFERENCES Dura Wear Resisting Plastics, by Eastern Clay Products Co., pages 1-4, June 20, 1949. 

